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Ed Smallhorn was
responsible for the design of a breathing simulator system. Such systems
are designed to simulate human respiratory output for testing mining,
fire fighting, diving and medical breathing systems. For diving
applications, the manikin with mounted breathing apparatus is placed in
a wet hyperbaric chamber that simulates the sub sea environment. In this
design, the breathing machine is based on a rolling diaphragm equipped
piston driven by a stepper motor. A computer and software controls the
piston motion to produce a desired breathing waveform while measuring
parameters such as oral pressure and breathing volume. An output on the monitor is an oral
pressure-volume diagram from which the computer calculates work of
breathing.
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